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Finding the Fourth Proportional to 405,913.80, 608,870.70 and 125,430.60

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Solution

The fourth proportional to 405,913.80, 608,870.70 and 125,430.60 is: 188,145.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,913.80 : 608,870.70 = 125,430.60 : x
  2. Step 2: Convert to fraction form
    405,913.80/608,870.70 = 125,430.60/x
  3. Step 3: Cross multiply
    405,913.80x = 608,870.70 × 125,430.60
  4. Step 4: Simplify right side
    405,913.80x = 76,371,017,223.42
  5. Step 5: Solve for x
    x = 76,371,017,223.42/405,913.80
  6. Step 6: Final answer
    x = 188,145.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.